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Underwater demolition, for removal of damaged structure in repair work, or to prepare an area for new construction. Underwater surveying : site surveys and geological surveys Underwater inspection of underwater structures, installations, and sites is a common diving activity, applicable to planning, installation, and maintenance phases, but the ...
Underwater construction is industrial construction in an underwater environment. There is often, but not necessarily, a significant component of commercial diving involved. [2] [3] It is a part of the marine construction industry. [4] Underwater welding may be used, and for repair work cutting of steel or concrete may be necessary.
Assembled tremie placing concrete underwater Hopper, pipes and lifting cap components of a tremie concrete placement tube. A tremie is a watertight pipe, usually of about 250 mm inside diameter (150 to 300 mm), [1] with a conical hopper at its upper end above the water level. It may have a loose plug or a valve at the bottom end.
Schematic cross section of a pressurized caisson. In geotechnical engineering, a caisson (/ ˈ k eɪ s ən,-s ɒ n /; borrowed from French caisson 'box', from Italian cassone 'large box', an augmentative of cassa) is a watertight retaining structure [1] used, for example, to work on the foundations of a bridge pier, for the construction of a concrete dam, [2] or for the repair of ships.
Underwater placement methods include the tremie, pumping, skip placement, manual placement using toggle bags, and bagwork. [129] A tremie is a vertical, or near-vertical, pipe with a hopper at the top used to pour concrete underwater in a way that avoids washout of cement from the mix due to turbulent water contact with the concrete while it is ...
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Robotic Hydrodemolition in Folkestone, UK. Hydrodemolition of concrete exposing the rebar.. Hydrodemolition (also known as hydro demolition, hydroblasting, hydro blasting, hydromilling, waterblasting, and waterjetting) is a concrete removal technique which utilizes high-pressure water, often containing an abrasive material, to remove deteriorated and sound concrete as well as asphalt and grout.
Underwater use of hydrophobic concrete is a major application in marine facilities. Is often used to hold water to create pools and ponds. NASA used hydrophobic concrete to build the swimming pool used to train astronauts for walking on the Moon. Hydrophobic concrete is also used in applications that are exposed to rain or rain puddling, such ...
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